Gluconic acid is a non-volatile organic acid produced in grapes when certain bacteria and mould (especially Botrytis cinerea) cause glucose to oxidise. This simple test is performed with a spectrophotometer to provide an accurate result in real units of grams per litre.

THIS PRODUCT REQUIRES THE USE OF A SPECTROPHOTOMETER

To ensure the integrity and long life of this perishable product we prefer to ship to you on Monday, Tuesday and Wednesday. This is because we don’t want it to suffer if it is delayed over a weekend. If you are sure we can send it safely later in the week then please advise us accordingly.